lkml.org 
[lkml]   [2019]   [Jan]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v5 17/23] drm/sun4i: Move access control before setting the register as documented
Date
From: Maxime Ripard <maxime.ripard@bootlin.com>

Unlike what is currently being done, the ACCESS_CTRL bit documentation asks
that this bit should be set before modifying any register. The code in the
BSP also does this, so make sure we do this as well.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
---
drivers/gpu/drm/sun4i/sun4i_frontend.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_frontend.c b/drivers/gpu/drm/sun4i/sun4i_frontend.c
index 1153539f3aef..88ac77518610 100644
--- a/drivers/gpu/drm/sun4i/sun4i_frontend.c
+++ b/drivers/gpu/drm/sun4i/sun4i_frontend.c
@@ -75,6 +75,10 @@ static void sun4i_frontend_scaler_init(struct sun4i_frontend *frontend)
{
int i;

+ regmap_write_bits(frontend->regs, SUN4I_FRONTEND_FRM_CTRL_REG,
+ SUN4I_FRONTEND_FRM_CTRL_COEF_ACCESS_CTRL,
+ SUN4I_FRONTEND_FRM_CTRL_COEF_ACCESS_CTRL);
+
for (i = 0; i < 32; i++) {
regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_HORZCOEF0_REG(i),
sun4i_frontend_horz_coef[2 * i]);
@@ -90,9 +94,6 @@ static void sun4i_frontend_scaler_init(struct sun4i_frontend *frontend)
sun4i_frontend_vert_coef[i]);
}

- regmap_update_bits(frontend->regs, SUN4I_FRONTEND_FRM_CTRL_REG,
- SUN4I_FRONTEND_FRM_CTRL_COEF_ACCESS_CTRL,
- SUN4I_FRONTEND_FRM_CTRL_COEF_ACCESS_CTRL);
}

int sun4i_frontend_init(struct sun4i_frontend *frontend)
--
2.20.1
\
 
 \ /
  Last update: 2019-01-18 15:45    [W:0.124 / U:0.468 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site